STAC9766 Datasheet, PDF (48/97 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

STAC9766/9767
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
PC AUDIO
8.1.2. Master Volume Registers (02h)
Default: 8000h
D15
D14
Mute
RSRVD
D7
D6
RESERVED
D13
ML5
D5
MR5
Bit(s) Reset Value
Name
15
1
Mute
14
0
RESERVED
13
0
ML5
12:8
0
7:6
0
5
0
ML<4:0>
RESERVED
MR5
4:0
0
MR<4:0>
D12
ML4
D4
MR4
D11
ML3
D3
MR3
D10
ML2
D2
MR2
D9
ML1
D1
MR1
Description
0 = no mute
1 = Mutes both left & right channels
Bit not used, should read back 0
0 = Lineout attenuation is a function of bits12-8
1 = Forces register bits 12-8 to be 11111
Always reads back 0
Left Lineout Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
Bits not used, should read back 0
0 = Lineout attenuation is a function of bits 4-0
1 = Forces register bits 4-0 to be 11111
Always reads back 0
Right Channel Lineout Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
8.1.3. Headphone Volume Registers (04h)
Default: 8000h
D15
D14
Mute
RSRVD
D7
D6
RESERVED
D13
HPL5
D5
HPR5
Bit(s) Reset Value
Name
15
1
Mute
14
0
RESERVED
13
0
ML5
D12
HPL4
D4
HPR4
D11
HPL3
D3
HPR3
D10
HPL2
D2
HPR2
D9
HPL1
D1
HPR1
Description
0 = no mute
1 = Mutes both left & right channels
Bit not used, should read back 0
0 = Headphone attenuation is a function of bits12-8
1 = forces register bits 12-8 to be 11111
Always reads back 0
D8
ML0
D0
MR0
D8
HPL0
D0
HPR0
IDT™
48
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06